UK tax filing software for companies and accountants

Accounts to Companies House, CT600 to HMRC, and Making Tax Digital for VAT and Income Tax. Accounts and CT600 are paid per filing, with no subscription.

5.0 from 33 Google reviews HMRC recognised software Companies House recognised software UK-built & supported No subscription for accounts and CT600

For limited companies

Corporation Tax

£10 + VAT per company

CT600 and iXBRL computations filed to HMRC, with your statutory accounts filed to Companies House. One fee covers both.

Accounts Production

Included with the £10 + VAT filing

FRS 105 micro-entity and FRS 102 Section 1A accounts from Xero, QuickBooks or a trial balance, tagged as iXBRL automatically.

Dormant companies

£5 + VAT per company

Dormant accounts to Companies House and a nil CT600 to HMRC. Enter the company number and submit.

Working Papers

Free with every filing

Year-end working papers and review points built into accounts production.

Making Tax Digital and free tools

MTD VAT

£30 + VAT a year, first year free

Making Tax Digital VAT returns, including bridging from Excel spreadsheets.

MTD for Income Tax

£30 + VAT a year, first year free

Quarterly updates and the final declaration for sole traders and landlords, from Excel or digital records.

Calculators

Free

Free UK tax calculators: Corporation Tax with marginal relief, VAT, take-home pay, salary vs dividend, dividend tax and more.

Compare prices

Checked September 2026

How our CT600 and accounts price compares with TinyTax, Xero, Taxpipe and others.

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What our customers say

5.0 out of 5 from 33 Google reviews

I recently used Tax Optimiser for the first time to submit my accounts to Companies House and HMRC, and I’m thoroughly impressed. The platform is remarkably easy to manage, walking you through the entire process without any complex jargon. On top of that, their prices are extremely competitive. It saved me a ton of time and stress—I will definitely be using them again next year.

Zulfiqar Ali Google review

I had next to no confidence that Tax Optimiser could handle accounts submission and Corporation Tax. But I gave it a whirl… Both Companies House and HMRC have initially accepted the submissions… I previously filed on professional software and I paid about £1500. This is dirt cheap.

Robert B Google review

Excellent software. Very affordable if you're doing your own small company accounts. Links with Xero… Tax Optimiser has been a complete life saver for me.

Felix Oram Google review